The system operates with impressive simplicity for a standard wallet. When a transaction is initiated from an account, its public key is permanently recorded on the blockchain. Theoretically, a sufficiently advanced quantum computer might reverse-engineer this public key to uncover the private key, enabling it to authorize transactions as if it were the account owner.
The forthcoming Hegotá upgrade, set to launch in 2027, will not inherently provide Ethereum with quantum resistance. Its primary role is to ensure that subsequent developments remain on track, which the Foundation has articulated clearly: “Hegotá is not the PQ fork. It is the fork that determines when the PQ forks take place.”
The term PQ fork references the anticipated hard fork, or series of forks, that will implement post-quantum cryptography into Ethereum.
Behind Hegotá lies a set of proposals that address the cryptographic challenges. Two of these proposals will allow accounts to replace secp256k1, the signature algorithm utilized by Ethereum since its inception, as their main key. A third proposal begins to phase out validator withdrawal credentials that are still linked to it, further advancing the redesign of the deposit contract, as CoinDesk reported last month.
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The timeline is tight, with five hard forks expected post-Hegotá, averaging about one every 7.2 months. The Foundation notes that these will need to overlap rather than be released sequentially.